Draft: F fix get parents

Summary

This is a fix for #157 .

The other functions in caosdb.js need to be checked for similar problems.

This was implemented by @salexan a while ago.

Test Environment

How to set up a test environment for manual testing?

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src/core/js/tour.js

@@ -1112,8 +1112,7 @@ var tour = new function () {
                     if (sub.id) {
                         index[sub.id] = sub;
                     }
-                    if (sub.id) {
-                        index[sub.id] = sub;
+                    if (sub instanceof tour.Page) {
                         pages.push(sub.id);
                     }
                 }